Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Accrued Liabilities [Abstract]
Accrued warranty, current, see Note 1	$ 109	$ 102
Accrued compensation, including commissions and vacation	785	1,177
Accrued sales and other taxes	904	439
Distributor rights liability, current	85	0
Accrued professional fees and other accrued liabilities	477	274
Total other accrued liabilities	$ 2,360	$ 1,992